Microinfiltração marginal e análise da superfície de cimentos odontológicos empregados em prótese fixa

Abstract

A major goal of the cement fixing a prosthesis to the tooth, is to seal the gap or interface between them. A failure in this may lead to the phenomenon of microleakage. This study evaluated in vitro microleakage in unit fixed prostheses cemented with three types of cements: zinc phosphate, the resin modified glass ionomer cement, resin cement self-ahesive. For this, were prepared in a standardized way 115 teeth. On these were cemented metal ceramic crown and metal-free crowns. For the aging was used the technique of thermal cycling (range, 5 to 55oC), and before being cut in the mesio-distal, they were stained with basic fuccin (0.5%). The results showed that the resin cement and the resin modified glass ionomer cement obtained similar results in both situations (metaloceramic crowns and metal-free), and when they were compared to zinc phosphate cement, the results were significantly better. It was concluded that: the resin cement and glass ionomer cement promoted better sealing of the tooth-prosthesis interface in both cases tested.